1. Department of Emergency, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
2. Department of Medical Biology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
3. Department of Anesthesiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China